31532231051 has 4 divisors (see below), whose sum is σ = 32203129632. Its totient is φ = 30861332472.

The previous prime is 31532231047. The next prime is 31532231111. The reversal of 31532231051 is 15013223513.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31532231051 - 2² = 31532231047 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31532231051.

It is not an unprimeable number, because it can be changed into a prime (31532231021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335449220 + ... + 335449313.

It is an arithmetic number, because the mean of its divisors is an integer number (8050782408).

Almost surely, 2^31532231051 is an apocalyptic number.

31532231051 is a deficient number, since it is larger than the sum of its proper divisors (670898581).

31532231051 is an equidigital number, since it uses as much as digits as its factorization.

31532231051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670898580.

The product of its (nonzero) digits is 2700, while the sum is 26.

Adding to 31532231051 its reverse (15013223513), we get a palindrome (46545454564).

The spelling of 31532231051 in words is "thirty-one billion, five hundred thirty-two million, two hundred thirty-one thousand, fifty-one".